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Rheological behavior of wood in stress relaxation under compression
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics. Univ Boras, Fac Text Engn & Business, S-50190 Boras, Sweden.
Univ Ljubljana, Fac Civil & Geodet Engn, Ljubljana 1000, Slovenia.
Univ Boras, Fac Text Engn & Business, S-50190 Boras, Sweden.
2018 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 52, no 3, p. 793-808Article in journal (Refereed) Published
Abstract [en]

Rheological behavior of wood under uniaxial compression along and perpendicular to the grain in constant environment was examined. Tests with constant deformation rate until failure and stress relaxation tests with constant deformation applied stepwise were carried out. The experimental results of stress relaxation showed nonlinear material behavior over time that got more prominent under high deformation levels. Considerable amount of stress relaxed during applying the deformation. Wood experienced greater stress relaxation along the grain than perpendicular to it. Three rheological models for orthotropic material were calibrated to the experimentally determined stress-time curves in longitudinal and transverse directions simultaneously. Small deformation levels assuming linear strains were accounted for in the models. Required elastic material parameters were determined from the tests with constant deformation rate. A model including the highest number of viscoelastic material parameters was the most successful in predicting stress relaxation of wood under stepwise deformation. Modeling indicated that wood behavior was very close to linear viscoelastic in relaxation under small deformation. The obtained material parameters made the model suitable for predicting rheological behavior of wood comprehensively, under sustained deformation or load in constant conditions.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 52, no 3, p. 793-808
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:uu:diva-352579DOI: 10.1007/s00226-018-0993-2ISI: 000430010200011OAI: oai:DiVA.org:uu-352579DiVA, id: diva2:1237094
Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2018-08-07Bibliographically approved

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